Ouken's past is revealed as his desire to become stronger and put an end to his father's cruel reign is recounted. Over the course of the hard-fought war against the Gigantes, the prince distinguishes himself by his conduct, until one fateful day.
The only thing that's 
certain is the temperature
الشّيء الوحيد المؤكّد هو درجة الحرارة
Sicher ist nur die Temperatur,
die wir spüren
A única coisa certa é essa temperatura